"Websites enable one-click installation of modified software onto set-top boxes or other internet-connected devices," the MPAA said. Then the software taps into an "infringing ecosystem" of content add-ons and portals, with more than 750 websites offering such infringing devices or software.

"Online content theft undermines the economic success of film and television, threatens the livelihoods of millions of creators, and harms consumers by spreading viruses and malware," MPAA told the USTR. "In particular, streaming device piracy – enabled by preloaded piracy devices and unauthorized add-ons – poses a significant and evolving challenge. Today, 6% of North American households own a device with software configured to access pirated content."

MPAA also said that of the 38 million active Kodi users, 26 million use piracy add-on repository tvaddons.ag.

The group said such infringing traffic hurts not only copyright holders, but users who are more subject to malware, which is a revenue source for pirate sites.